Chamberlain LiftMaster PROFESSIONAL SECURITY+ 2500C Manuel Du Propriétaire page 24

ADJUSTMENT 1
Program the travel limits
Travel limits regulate the points at which the
door will stop when moving up or down. Follow
the steps below to set the desired up limit. The
down limit will be set automatically during step 5.
During this step, use the remote control shipped
with your opener. Any other remote will not work
until its code is programmed into your openers
receiver (see "Programming").
1. Activate the door using the door control or the
remote. The trolley will reconnect and the door will
open between 4 and 5 feet.
2. Use the two buttons (1), (2) on the control panel to
place the opener into limit setting mode:
Press and hold the "Learn" button (2) while you
press the "Limit" button on the left (1), then release
both buttons. The indicator light (3) will blink
slowly. The opener is now in limit learn mode.
3. Press the left button (1) until the door travels up to
the desired limit. If the door goes above the
desired up limit, press the right button (2) to lower
it. Check to be sure the door is high enough for
your vehicle. Adjust if necessary, using both
buttons.
4. Place a one-inch board (or a 2x4 laid flat) on the
floor, centered under the garage door.
5. Press the remote (4) or door control push button.
The door will travel down, touch the board, then
reverse and stop in the up limit position. The
indicator light will stop blinking and turn off. The
opener has learned the up and down limits.
Remove the wood board.
During step 5, if the door reverses before touching
the board, increase the down force (See "Force
Adjustment"), then repeat steps 1-5 above.
If the door stops before reaching the up limit,
increase the up force by small adjustments until it
reaches the up limit. (See "Force Adjustment").
Repeat step 5.
WARNING
Without a properly installed safety reversal system,
persons (particularly small children) could be
CAUTION
SERIOUSLY INJURED or KILLED by a closing garage
door.
• Incorrect adjustment of garage door travel limits will
interfere with proper operation of safety reversal
system.
• If one control (force or travel limits) is adjusted, the
other control may also need adjustment.
• After ANY adjustments are made, the safety reversal
system MUST be tested. Door MUST reverse on
contact with one-inch high object (or 2x4 laid flat) on
WARNING
floor.
CAUTION
To prevent damage to vehicles, be sure fully open door
provides adequate clearance.
Force
Adjustment
Antenna
Limit Button (1)
(Left)
24
Indicator Light (3)
Learn Button (2)
(Right)
(4)